To DrBay's comment, we are all unique individuals. For many people's ears and in relation to their equipment, they may not be able to tell the difference between the components you mention. Others however, can tell the difference. We are all different and the end goal is enjoyment of the music. What pleases some will not please others. Spend up to the point that one can not tell the difference. As someone once told me, my ears are poor but my wallet is fat !!
Have a great weekend everyone.